package org.zachary.imitation.raft.util;

final class HeapByteBufUtil {

	static byte getByte(byte[] memory, int index) {
		return memory[index];
	}

	static short getShort(byte[] memory, int index) {
		return (short) (memory[index] << 8 | memory[index + 1] & 0xFF);
	}

	static short getShortLE(byte[] memory, int index) {
		return (short) (memory[index] & 0xff | memory[index + 1] << 8);
	}

	static int getUnsignedMedium(byte[] memory, int index) {
		return (memory[index] & 0xff) << 16 | (memory[index + 1] & 0xff) << 8 | memory[index + 2] & 0xff;
	}

	static int getUnsignedMediumLE(byte[] memory, int index) {
		return memory[index] & 0xff | (memory[index + 1] & 0xff) << 8 | (memory[index + 2] & 0xff) << 16;
	}

	static int getInt(byte[] memory, int index) {
		return (memory[index] & 0xff) << 24 | (memory[index + 1] & 0xff) << 16 | (memory[index + 2] & 0xff) << 8
				| memory[index + 3] & 0xff;
	}

	static int getIntLE(byte[] memory, int index) {
		return memory[index] & 0xff | (memory[index + 1] & 0xff) << 8 | (memory[index + 2] & 0xff) << 16
				| (memory[index + 3] & 0xff) << 24;
	}

	static long getLong(byte[] memory, int index) {
		return ((long) memory[index] & 0xff) << 56 | ((long) memory[index + 1] & 0xff) << 48
				| ((long) memory[index + 2] & 0xff) << 40 | ((long) memory[index + 3] & 0xff) << 32
				| ((long) memory[index + 4] & 0xff) << 24 | ((long) memory[index + 5] & 0xff) << 16
				| ((long) memory[index + 6] & 0xff) << 8 | (long) memory[index + 7] & 0xff;
	}

	static long getLongLE(byte[] memory, int index) {
		return (long) memory[index] & 0xff | ((long) memory[index + 1] & 0xff) << 8
				| ((long) memory[index + 2] & 0xff) << 16 | ((long) memory[index + 3] & 0xff) << 24
				| ((long) memory[index + 4] & 0xff) << 32 | ((long) memory[index + 5] & 0xff) << 40
				| ((long) memory[index + 6] & 0xff) << 48 | ((long) memory[index + 7] & 0xff) << 56;
	}

	static void setByte(byte[] memory, int index, int value) {
		memory[index] = (byte) value;
	}

	static void setShort(byte[] memory, int index, int value) {
		memory[index] = (byte) (value >>> 8);
		memory[index + 1] = (byte) value;
	}

	static void setShortLE(byte[] memory, int index, int value) {
		memory[index] = (byte) value;
		memory[index + 1] = (byte) (value >>> 8);
	}

	static void setMedium(byte[] memory, int index, int value) {
		memory[index] = (byte) (value >>> 16);
		memory[index + 1] = (byte) (value >>> 8);
		memory[index + 2] = (byte) value;
	}

	static void setMediumLE(byte[] memory, int index, int value) {
		memory[index] = (byte) value;
		memory[index + 1] = (byte) (value >>> 8);
		memory[index + 2] = (byte) (value >>> 16);
	}

	static void setInt(byte[] memory, int index, int value) {
		memory[index] = (byte) (value >>> 24);
		memory[index + 1] = (byte) (value >>> 16);
		memory[index + 2] = (byte) (value >>> 8);
		memory[index + 3] = (byte) value;
	}

	static void setIntLE(byte[] memory, int index, int value) {
		memory[index] = (byte) value;
		memory[index + 1] = (byte) (value >>> 8);
		memory[index + 2] = (byte) (value >>> 16);
		memory[index + 3] = (byte) (value >>> 24);
	}

	static void setLong(byte[] memory, int index, long value) {
		memory[index] = (byte) (value >>> 56);
		memory[index + 1] = (byte) (value >>> 48);
		memory[index + 2] = (byte) (value >>> 40);
		memory[index + 3] = (byte) (value >>> 32);
		memory[index + 4] = (byte) (value >>> 24);
		memory[index + 5] = (byte) (value >>> 16);
		memory[index + 6] = (byte) (value >>> 8);
		memory[index + 7] = (byte) value;
	}

	static void setLongLE(byte[] memory, int index, long value) {
		memory[index] = (byte) value;
		memory[index + 1] = (byte) (value >>> 8);
		memory[index + 2] = (byte) (value >>> 16);
		memory[index + 3] = (byte) (value >>> 24);
		memory[index + 4] = (byte) (value >>> 32);
		memory[index + 5] = (byte) (value >>> 40);
		memory[index + 6] = (byte) (value >>> 48);
		memory[index + 7] = (byte) (value >>> 56);
	}

	private HeapByteBufUtil() {
	}
}
